When they say radiation from phones and Fukiahima but?

To keep it simple. Yes, the sun does emit radiation, but very little of the radiation reaches us as it has to pass far through space and then hit the magnetic field of the earth, the atmosphere and Ozone witch filters out dangerous radiation. Radiation from radioactive material is much more intensive and emits a wide array of waves that can resonate on subatomic, inter-atomic and inter-molecular levels. This radiation can cause DNA corruption and the destruction of many vital substances needed in the body...and as a result of the high intensity, they can even generate high levels of heat...that's why we use it in power plants, but think if it can heat up water that easily, what it can do to you if you come to close. You might almost say its like coming to close to the sun although the sun undergoes fusion and that makes it so extremely intense.

Hope this is helpful:-)

YEs, but the Earth has a protective magnetic field that will limit the amount of radiation we receive.